Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e64c0794585f64…

MALICIOUS

PDF

83.6 KB Created: 2021-04-02 06:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 951676d7c6761c1cfe6df7a7ddbd4298 SHA-1: 48e5140e211fab1c0c3ed0d69fd5c1dff51c5a19 SHA-256: 04e64c0794585f64dc722b9b46f0f32f1f538112984c7fb1cf71bcef4d0f26e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to social media posting, which is used to direct users to external sites like vilenefex.ru. The presence of many disposable domains and link farm characteristics further indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/strik?utm_term=how+to+share+personal+post+to+business+page PDF link annotation
    • http://rusakadovub.sportsontheweb.net/how_to_program_genie_gm3t_remote.pdfIn PDF document text
    • http://kazexajisodibu.medianewsonline.com/namaz_e_janaza_ki_dua.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/fokawekikizolo.pdfIn PDF document text
    • https://tamexixufose.weebly.com/uploads/1/3/0/7/130739892/tazazuse.pdfIn PDF document text
    • https://cdn.sqhk.co/virawamimozi/4OOEhhK/15283968287.pdfIn PDF document text
    • http://wersita.fun/vatican_assassins_eric_jon_phelpsob2ku.pdfIn PDF document text
    • http://sesalon.xyz/evinrude_e-tec_150_price0qmn8.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/45370241762.pdfIn PDF document text
    • http://shopsupergood.site/48229831711zm68p.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/jaxuworirudowokenfkvuq.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/PiiheUl/8609937575.pdfIn PDF document text
    • https://mebugiroxubo.weebly.com/uploads/1/3/0/7/130776511/rovowubapafakabi.pdfIn PDF document text
    • http://byt-upak.ru/jigodimepode70as.pdfIn PDF document text
    • http://telovajov.medianewsonline.com/world_war_z_cast_zombie.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/ijhcieA/zawafeza.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/d1hb8gc/77064139452.pdfIn PDF document text
    • https://vusekuzobogurow.weebly.com/uploads/1/3/5/3/135327372/a3b515f319834.pdfIn PDF document text
    • http://zenajok.medianewsonline.com/how_to_change_time_on_nortel_networks_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/lasumalena/eyuhc1u/medical_legal_report_template.pdfIn PDF document text
    • http://ritual-venki.online/royal_1830mx_cross-cut_paper_shredder_reviewsva6jb.pdfIn PDF document text
    • https://vulajavup.weebly.com/uploads/1/3/4/6/134683256/1695324.pdfIn PDF document text
    • http://lishop.site/samsung_scx-4623f_series_scanner_softwareahazq.pdfIn PDF document text
    • http://makamar.tech/jarudpqi4n.pdfIn PDF document text
    • http://bumosid.getenjoyment.net/convert_to_dwg_autocad_2020_free.pdfIn PDF document text
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/26665b0c83.pdfIn PDF document text
    • http://gizigevom.mygamesonline.org/mumbai_cooperative_housing_society_bye_laws.pdfIn PDF document text
    • http://cashbackmoney.info/natural_remedy_for_pimples_and_dark_spotsscjqh.pdfIn PDF document text
    • http://leftoutclub.com/jefutemagekunovikulunezugkcpfn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rizivubonulej.atwebpages.com/radio_broadcasting_script_sample.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 5156 bytes
SHA-256: a391fd6737bef1896f67a89f674877b1a1e6e97136281b0ba31f8f895e11b856
font_01_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 1796 bytes
SHA-256: dfab3945eace5ba27be1ad95d63d5142397767eab6bca27773794b33bda2302c
font_02_sfnt_off00010c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6F 10892 bytes
SHA-256: f2f345ec570c85c251606030bd8136c1c492f257feeb788c03a16ed1fdeadba1
font_03_sfnt_off000131bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BD 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333